添加 0718 最长重复数组 JavaScript 滚动数组解法

problems/0718.最长重复子数组.md

@@ -278,7 +278,26 @@ const findLength = (A, B) => {
     return res;
 };
 ```
-
+> 滚动数组
+```javascript
+const findLength = (nums1, nums2) => {
+    let len1 = nums1.length, len2 = nums2.length;
+    // dp[i][j]: 以nums1[i-1]、nums2[j-1]为结尾的最长公共子数组的长度
+    let dp = new Array(len2+1).fill(0);
+    let res = 0;
+    for (let i = 1; i <= len1; i++) {
+        for (let j = len2; j > 0; j--) {
+            if (nums1[i-1] === nums2[j-1]) {
+                dp[j] = dp[j-1] + 1;
+            } else {
+                dp[j] = 0;
+            }
+            res = Math.max(res, dp[j]);
+        }
+    }
+    return res;
+}
+```
 
 
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